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Excelsior accepts every CLEP, except, if I have this correctly, English Composition (and retired tests similar to English Composition like the former Freshman College Composition).
The three CLEPs that should count specifically towards a major in psychology are Introductory Psychology (duplicative alternative test: in the subject
UExcel Introduction to Psychology), Human Growth and Development (duplicative alternative tests: DSST Lifespan Developmental Psychology, ECE Life Span Developmental Psychology) and Introduction to Educational Psychology.
Your richest single source of testing-out credits in psychology at Excelsior will be the
ECE exams from Excelsior itself. They offer Abnormal Psychology, Psychology of Adulthood and Aging, Social Psychology, and Research Methods in Psychology. The
DSST exams in Fundamentals of Counseling, and Substance Abuse, are also popular.
TECEP, the small paper-based testing program from Thomas Edison State College, offers a test in Psychology of Women.
There are also a few tests in very close cognate subjects to, or interdisciplinary subjects including, psychology, that aren't listed under psychology, that a destination school might in its discretion accept towards a psychology major. Check with the school if your taking a test would depend on its counting toward the major and it isn't absolutely clear. Listed under Sociology: TECEP Marriage and Family, ECE Foundations of Gerontology, ECE Juvenile Delinquency. Under Business: ECE or DSST Organizational Behavior. Under Communication: ECE Interpersonal Communication. DSST Foundations of Education should be on your radar, but I think would be pushing it at most schools for inclusion in a psychology major. Likewise CLEP or UExcel Intro Sociology.
And even if any of these wouldn't apply towards your major, they could be natural candidates for your free electives, etc., for the overlap and common ground.
If you're in range of New Britain, Connecticut, Charter Oak State College offers there, and only there and only on two scheduled windows per month or so, their Pathways exams in Child Development Psychology, Infant/Toddler Growth and Development, Early Language and Literacy, and Introduction to Early Childhood Education.
So, you have three
CLEPs specifically to look at to apply towards a psychology major, and a fistful of tests that aren't quite CLEPs, but are from very similar programs.